/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.protocol.influxdb.function.aggregator;

import org.apache.iotdb.db.mpp.plan.expression.Expression;
import org.apache.iotdb.db.protocol.influxdb.constant.InfluxSqlConstant;
import org.apache.iotdb.db.protocol.influxdb.function.InfluxFunctionValue;
import org.apache.iotdb.db.utils.MathUtils;

import java.util.ArrayList;
import java.util.List;

public class InfluxSumFunction extends InfluxAggregator {
    private final List<Double> numbers = new ArrayList<>();
    private long sum = 0;

    public InfluxSumFunction(List<Expression> expressionList) {
        super(expressionList);
    }

    @Override
    public InfluxFunctionValue calculateBruteForce() {
        return new InfluxFunctionValue(numbers.size() == 0 ? numbers : MathUtils.sum(numbers), 0L);
    }

    @Override
    public InfluxFunctionValue calculateByIoTDBFunc() {
        return new InfluxFunctionValue(sum, 0L);
    }

    @Override
    public String getFunctionName() {
        return InfluxSqlConstant.SUM;
    }

    @Override
    public void updateValueBruteForce(InfluxFunctionValue functionValue) {
        Object value = functionValue.getValue();
        if (!(value instanceof Number)) {
            throw new IllegalArgumentException("not support this type");
        }

        double tmpValue = ((Number) value).doubleValue();
        numbers.add(tmpValue);
    }

    @Override
    public void updateValueIoTDBFunc(InfluxFunctionValue... functionValues) {
        sum += (double) functionValues[0].getValue();
    }
}
